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Abstract In this paper we present the use of ASTER data for the creation of a Digital Terrain Model (DMT) of high accuracy. Using a stereo pair of ASTER satellite images with 15m resolution we created two DMTs: one with a 30m pixel size and another one with a 15m pixel size. Then we made a statistical verification of the two DTMs accuracy. We created another DTM with 30m pixel size from digitized contours of 1:50000 scale topographic maps. We first made an optical comparison of the two DTMs with 30m pixel size. Then we subtracted the two DTMs and we presented their difference. Finally, we verified the DTMs accuracy using 68 points of a well‐known elevation. All the results demonstrated that DTMs derived from ASTER data have very good accuracy. 相似文献
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Jérôme Korona Etienne Berthier Marc Bernard Frédérique Rémy Eric Thouvenot 《ISPRS Journal of Photogrammetry and Remote Sensing》2009,64(2):204-212
Monitoring the evolution of polar glaciers, ice caps and ice streams is of utmost importance because they constitute a good indicator of global climate change and contribute significantly to ongoing sea level rise. Accurate topographic surveys are particularly relevant as they reflect the geometric evolution of ice masses. Unfortunately, the precision and/or spatial coverage of current satellite missions (radar altimetry, ICESat) or field surveys are generally insufficient. Improving our knowledge of the topography of Polar Regions is the goal of the SPIRIT (SPOT 5 stereoscopic survey of Polar Ice: Reference Images and Topographies) international polar year (IPY) project. SPIRIT will allow (1) the acquisition of a large archive of SPOT 5 stereoscopic images covering most polar ice masses and, (2) the delivery of digital terrain models (DTM) to the scientific community.Here, we present the architecture of this project and the coverage achieved over northern and southern polar areas during the first year of IPY (July 2007 to April 2008). We also provide the first accuracy assessments of the SPIRIT DTMs. Over Jakobshavn Isbrae (West Greenland), SPIRIT elevations are within ±6 m of ICESat elevations for 90% of the data. Some comparisons with ICESat profiles over Devon ice cap (Canada), St Elias Mountains (Alaska) and west Svalbard confirm the good overall quality of the SPIRIT DTMs although large errors are observed in the flat accumulation area of Devon ice cap. We then demonstrate the potential of SPIRIT DTMs for mapping glacier elevation changes. The comparison of summer-2007 SPIRIT DTMs with October-2003 ICESat profiles shows that the thinning of Jakobshavn Isbrae (by 30–40 m in 4 years) is restricted to the fast glacier trunk. The thinning of the coastal part of the ice stream (by over 100 m) and the retreat of its calving front (by up to 10 km) are clearly depicted by comparing the SPIRIT DTM to an ASTER April-2003 DTM. 相似文献
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SPOT5与ERS-2卫星影像的联合立体定位 总被引：3，自引：3，他引：0
本文将SPOT5与ERS-2卫星影像联立构成一组立体像对,并通过立体定位的方式获取了地面点的三维坐标。根据本文立体像对前方交会的特殊几何图形,推导了立体定位理论精度的计算公式,并利用实验验证了公式的正确性,同时分析了影响立体定位精度的主要因素。实验结果表明,联合具有一定重叠度的SPOT5和ERS-2影像进行立体定位具有很强的可行性,其精度已可以满足部分测绘任务的要求。 相似文献
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利用MIVIS数据进行遥感图像模拟的研究 总被引：12，自引：0，他引：12
本文研究利用机载ＭＩＶＩＳ超光谱成像系统数据,运用光谱模拟,大气改正的方法,定量模拟了ＳＰＯＴ－ＨＲＶ ＸＳ１、ＸＳ２、ＸＳ３的地面反射率图像,并将模拟结果与相应的地面反射率实测值进行了对比。同时对成像系统ＭＴＦ的影响也进行了定量模拟分析。试验结果显示,ＳＰＯＴ图像的模拟值与地面实测值相一致。 相似文献
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Tino Pieczonka Tobias Bolch Manfred Buchroithner 《ISPRS Journal of Photogrammetry and Remote Sensing》2011,66(6):927-940
Multitemporal digital terrain models (DTM) are an important source for many purposes such as the detection of areas, which are susceptible to natural hazards such as landslides and glacial lake outburst floods, or for the examination of changes in glacier thickness. To exploit the potential of stereo satellite and aerial imagery for time series analysis, the employed methodology and software can be critical. A statistical analysis based on quartiles is presented to eliminate the influence of registration and elevation errors in DTMs. For our analysis, we used multi-temporal airborne and spaceborne stereoscopic images. The oldest images were recorded in the 1960s by the US American reconnaissance satellite Corona, while the most recent imagery are 2007 Cartosat-1 stereo scenes, along with one ASTER stereo pair. Complex panoramic distortion and limited spatial resolution resulted in the Corona and ASTER DTMs having the highest RMSEz. Due to differing acquisition techniques, applied software packages and temporal differences DTMs will never be identical. Therefore, we propose a relative vertical accuracy assessment with a master DTM. We chose the Cartosat-1 DTM as it showed the highest absolute accuracy. Inaccuracies between the master and the slave DTMs were adjusted by means of trend surfaces and outliers were successfully eliminated applying the interquartile range. 相似文献
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本研究以1987年5月30日接收的法国SPOT卫星标准假彩色合成影像为主要信息源,对大兴安岭阿木尔林业局火灾造成的林地损失进行了研究。文中着重介绍了面积量算方法、原理和误差;选取适量地面样地,用抽样统计和角规辅助目测方法计算蓄积损失并与二类调查结果进行比较;在影像上按火烧等级的判读结果、现地景观与烧死率─火灾的定量描述,及三者之间的一致性。结果表明,应用SPOT卫星资料,按本研究所介绍的方法进行火灾损失估计,可快速、经济地获得所需结果,并可满足精度要求。 相似文献
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基于多进制小波变换的遥感影像融合 总被引：7，自引：0，他引：7
首先介绍了遥感影像融合的理论和方法 ,然后在讨论多进制小波理论的基础上 ,提出了一种基于特征的多进制小波变换的影像融合算法 ,该算法根据待融合影像分辨率之比确定采用多进制小波 ,从而最大限度的利用了待融合影像的信息 ,防止影像信息的丢失。通过对具体影像的实验 ,证明融合后的影像最大限度地保留了待融合影像的光谱信息 ,同时提高了待融合影像的清晰度和空间分辨率。文中给出了SPOT全色影像与SPOT多光谱波段影像、SPOT全色影像与TM影像的融合结果 ,并与其他方法进行了比较 ,证明了本方法的优越性和自适应能力 相似文献
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The South Armorican shear zone is one of the major occurrences of Variscan basement in Europe. The objectives of the study were to compile a lineament and a structural map from remotely sensed SPOT imagery. Transparent color films, enhanced by high-pass filtering and by stretching color composites, and spatial filtered images were analysed. The major structure mapped corresponds to a dextral transcurrent shear belt in which C and S axes have been described. Late Paleozoic and Tertiary fracturations truncate these structures. The localisation, extension and geometry of granite domes were also precised. Lastly, this study provides a good example of structural interpretation of a moderate-relief terrain using high-resolution SPOT imagery. 相似文献
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基于IHS变换和小波变换的遥感影像融合 总被引：18，自引：0，他引：18
在遥感影像融合中，IHS变换法与小波变换法具有互补性，文中把这两种方法结合起来，提出了一种基于IHS变换与小波变换的影像融合方法。通过对具体影像的实验证明，该方法是有效的，达到了预期的目的。 相似文献
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Fusun Balik Sanli Saygin Abdikan Mustafa Tolga Esetlili Filiz Sunar 《Journal of the Indian Society of Remote Sensing》2017,45(4):591-601
This research aimed to explore the fusion of multispectral optical SPOT data with microwave L-band ALOS PALSAR and C-band RADARSAT-1 data for a detailed land use/cover mapping to find out the individual contributions of different wavelengths. Many fusion approaches have been implemented and analyzed for various applications using different remote sensing images. However, the fusion methods have conflict in the context of land use/cover (LULC) mapping using optical and synthetic aperture radar (SAR) images together. In this research two SAR images ALOS PALSAR and RADARSAT-1 were fused with SPOT data. Although, both SAR data were gathered in same polarization, and had same ground resolution, they differ in wavelengths. As different data fusion methods, intensity hue saturation (IHS), principal component analysis, discrete wavelet transformation, high pass frequency (HPF), and Ehlers, were performed and compared. For the quality analyses, visual interpretation was applied as a qualitative analysis, and spectral quality metrics of the fused images, such as correlation coefficient (CC) and universal image quality index (UIQI) were applied as a quantitative analysis. Furthermore, multispectral SPOT image and SAR fused images were classified with Maximum Likelihood Classification (MLC) method for the evaluation of their efficiencies. Ehlers gave the best score in the quality analysis and for the accuracy of LULC on LULC mapping of PALSAR and RADARSAT images. The results showed that the HPF method is in the second place with an increased thematic mapping accuracy. IHS had the worse results in all analyses. Overall, it is indicated that Ehlers method is a powerful technique to improve the LULC classification. 相似文献
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本论文尝试讨论两个主题：主题一为利用主成分分析PCA方法应用于像元阶层资料融合技术的研究。主题二为应用Dempster-Shafer evidence theory方法于特征阶层数据融合技术的研究。在第一个主题中，由于合成孔径雷达的数据具有全偏极特性，在此选取了对植被较为敏感的HV极化合成孔径雷达数据，与具有光谱特性的光学SPOT数据做数据融合处理以利接下来的地物分类。首先，本研究利用小波转换技术来滤除合成孔径雷达斑驳噪声，在接下来融合步骤中，主成分分析出来的第一部分（PCI）是用做完滤除噪声后的合成孔径雷达取代，在数据融合后，进行地物分类是采用最大似然法来分类融合影像。在第二个主题中，利用全偏极雷达数据的极化特性结合SPOT数据的光谱特性，其主要目的是为了增加分类的精确度。首先使用李式滤波器滤除全偏极雷达数据噪声，接下来同样是使用采用最大似然法来分类融合影像，（不同的在于全偏极雷达影像使用Wishart几率分布，在光学影像采用multivariate Gaussian几率分布）将每个类别中每个像元属于某个类别的几率值计算出来，再利用Dempster-Shafer evidence theory来结合这些类别的机率值。最后产生出一张新的分类影像。实验的结果显示分类的精确度比较于未融合的资料都有明显提升的效果，也证明了此两个数据融合方法对于不同数据特性的融合都是很成功的。 相似文献
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基于小波影像金字塔的影像自动匹配 总被引：3，自引：0，他引：3
数字影像高精度快速匹配是遥感影像3维信息提取的关键技术之一，文中对如何实现数字影像自动化匹配进行了研究，提出了一种基于小波影像金字塔的数字影像自动匹配方法。该方法在生成小波影像金字塔的基础上，利用交叉相关算法实现不同影像金字塔同一层影像间的匹配，利用视差控制将同名点从金字塔高层影像向低层影像进行传递。利用该方法对具体的SPOT影像进行了实验，表明基于小波影像金字塔的数字影像自动匹配方法具有较好的效果。 相似文献
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小波超分辨率重建算法及其在SPOT影像中的应用 总被引：1，自引：0，他引：1
影像超分辨率重建就是从一系列质量较差、分辨率较低的图像来重建图像质量更好、空间分辨率更高的影像的算法.在将所有低分辨率影像纳入同一参考格网中考虑的情况下,低分辨率数据相当于一非规则采样的交错采样数据.本文在多分辨率分析的基础上对基于小波的影像超分辨率重建理论进行介绍,并将现有的小波超分辨率重建算法推广到更一般的运动模型,以充分利用交错采样数据的内在规律性和结构特征,同时针对SPOT影像的特点,分析SPOT影像的调制传送函数,对SPOT重建影像进行包括去噪与解卷积的复原后处理.最后给出基于小波的SPOT影像超分辨率重建结果,表明遥感影像的超分辨率重建在应用中取得进展. 相似文献
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介绍了SPOT 5卫星HRG、HRS影像,讨论了SPOT 5影像空中三角测量的方法,以及利用SPOT 5影像进行DEM、DOM、DLG等地理信息产品生产的流程,对比了有、无地面控制纠正SPOT 5影像的精度情况,最后分析了SPOT 5影像在空间数据快速更新中的作用。 相似文献